The primary documentation for the various CEPR data extracts are the programs themselves. They provide an exact description of the definition of each of the variables and, in most cases, are heavily annotated.

The Census Bureau has produced a great deal of useful documentation about the CPS Job Tenure Supplement. The best place to start is the joint Census CPS home page.

For each year, the Census provides Codebooks with subject definitions, a data dictionary, and questionnaire to help understand each variable. For additional documentation, see the CEPR CPS Basic Documentation page.